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[Rcrook9190 <774089@xxxxxxxxxxxxxxxxxx>]

I can confirm My Macbook 6,1 has also suffered from this bug.. I have to
power cycle it 5 times before it will boot. But on a plus side.. it does
boot.

I do have an issue in that Apple do not have any updates for the efi on
my model on its web site. So my choices are, live with it or replace the
logic board at cost...

I have emailed my local Apple service centre requesting a copy of the
firmware of at least a chance to pay them to re-flash my Macbook. But I
am not hopeful. I dont think Apple will be too interested in fixing the
result of a bug in Open Source.

I am very disappointed. And whats the most disappointing is the release
notes had not been updated with the details of this issue before I
attempted (a week back) to install Natty. If it had been I would not be
in this situation.

PS: I just checked the release notes and there is still no warning about
this issue.

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https://bugs.launchpad.net/bugs/774089

Title:
  Booting fails 3 times, works every fourth time after new install of
  Natty Narwhal amd64 on Macbook Pro

Status in EFI Boot Manager:
  New
Status in Release Notes for Ubuntu:
  New
Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  Dear all,

  I am experiencing a severe problem after a new install of Natty
  Narwhal on my Macbook Pro last night:

  The install worked fine, but after reboot nothing came up except fo a black screen.
  After forcing the machine off and on multiple times I was able to bring up the rEFIt boot menu by pressing and holding the 'Alt' (or Option) key and I can then boot into MacOSX or Ubuntu without a problem.

  After restarting / powering off I then have to turn the computer on /
  off the same number of times (3 or 4, I don't remember exactly) where
  nothing happens until it works again.

  I am using a MacbookPro 5,5 (13.3 Inch). My harddisk is setup as follows:
  200MB Partition for EFI
  20GB Partition for OSX
  18.6 GB Partition for / (ext4)
  108.49 GB Partition for /home (ext4)
  1.86 GB Partition for swap

  Other people also seem to experience the same issue:
  http://ubuntuforums.org/showthread.php?p=10743955&posted=1#post10743955

  This is a pretty big problem for me, so your help is very much
  appreciated.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: linux-image-2.6.38-8-generic 2.6.38-8.42
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  NonfreeKernelModules: nvidia wl
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: NVidia [HDA NVidia], device 0: Cirrus Analog [Cirrus Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  paul       1487 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'NVidia'/'HDA NVidia at 0xd3480000 irq 20'
     Mixer name	: 'Cirrus Logic CS4206'
     Components	: 'HDA:10134206,106b4d00,00100301'
     Controls      : 17
     Simple ctrls  : 10
  Date: Sat Apr 30 14:53:06 2011
  HibernationDevice: RESUME=UUID=55afdc53-85cf-4d37-98c6-fbdd4f1c8482
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: Apple Inc. MacBookPro5,5
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=3aad2af7-44e6-4e93-8055-7e1818600eac ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-2.6.38-8-generic N/A
   linux-backports-modules-2.6.38-8-generic  N/A
   linux-firmware                            1.52
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/15/09
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP55.88Z.00AC.B03.0906151708
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-F2268AC8
  dmi.board.vendor: Apple Inc.
  dmi.chassis.asset.tag: Asset Tag#
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F2268AC8
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP55.88Z.00AC.B03.0906151708:bd06/15/09:svnAppleInc.:pnMacBookPro5,5:pvr1.0:rvnAppleInc.:rnMac-F2268AC8:rvr:cvnAppleInc.:ct10:cvrMac-F2268AC8:
  dmi.product.name: MacBookPro5,5
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.